Hoisting mechanism for dump trucks



1,624,978 P" 19,1927 J, E. REID ET AL HOISTING MECHANISM FOR DUMP TRUCKS Filed Sept. 12, 1923 3 Sheets-Sheet 1 v BY i WATTOR/JEE I JM'ML um M4 l 624, Apnl 19, 1927. E REID ET AL v 978 HOISTING MECHANISM FOR DUMFTRUCKS Filed Sept. 12, 1923 3 Sheets -Sheet 2 A TTORNE Y6 April 19, 1927. 1,624,978

J. E. REID ET AL HOISTING MECHANISM FOR DUMP TRUCKS Filed p -l 1923 I 5 Sheets-Sheet 3 A TTORN E Y5 Patented Apr. 19, 1927.

UNITED STATES JOSIAH E. REID AND CHARLES L. NEIN,

NATIONQL MOTOR COMPANY, OF NEW YORK, N.

OF NEW YORK, N, Y., ASSIGNORS T0 INTER- Y., A CORPORATION OF DELAWARE.

HOISTING MECHANISM FOR DUMP TRUCKS.

Application filed September 12, 1923. Serial No. 662,297.

In a co-pending application Serial No. 662,296 filed by the present applicants on September 12, 1923, there is shown, scribed and claimed broadly a mechanically operated hoisting mechanism for dump bodies of motor vehicles which is character ized by the employment of lifting screws supported on a vehicle frame with capacity to move angularly with respect thereto during the raising and lowering of the body. The particular embodiment of the invention illustrated in said co-pending case showed twolifting screws mounted in an integral saddle or cradle which itself is pivotally mounted through trunnions in the side frame members of the vehicle chassis. This saddie or cradle, extending transversely of the chassis occupies space which, under some circumstances, might be required for the accommodation of some necessary part or parts of the vehicle drive. That is to say, when a chain drive is employed, for instance, the chassis is clear between the side frame members and ample space is afforded for the said cradle or trunnion, but when a propeller shaft extends longitudinally under the chassis frame ample clearance therefor is necessary. The present invention relates to ahoisting mechanism which operates on the principle of that described in said co-pend- 1ng application but to a different embodiment wherein there is employed, in place of.

the single supporting saddle or cradle for the lifting screws, separate supporting cradles or saddles therefor which may be so spaced with respect to one another as to afford additional space or clearance, as for a longitudinally extending propeller shaft. Still another object of the invention is to mount the lifting, rods in independent cradles with capacity for angular movement not only with respect to the vehicle frame during the raising and lowering of the body but also with respect to one another so that they may conform to weaving of the frame or body and adapt themselves to relative movements impressed by other stresses. In accordance with the invention the same principle described and claimed in said co-pending case is employed but the revolvingnuts for actuating the lifting rods are mounted within casings which have their own supporting trunnions at opposite sides, the remote trunnions being journaled in brackets carried by the side frame members of the vehicle and the proximate trunnions being journaled in longitudinal supports mounted between the side frame members. The gearing for actuating the jack shafts by which the nuts are revolved may be enclosed within a housing which is supported through oppositely extending trunnions journaled in the said longitudinal supports. Another feature of the invention resides in the provision of self-aligning trunnions tothe end that the several casings where supported may readily adapt themselves tomovements of the chassis frame.

The important features of the construc: tion will appear with greater particularity hereinafter in connection with the detailed description of the embodiments shown in the accompanying drawings, wherein:

Figure 1 is a view showing in side elevation and somewhat conventionally the relative disposition of the propeller shaft and final drive ,of a motor vehicle to the side frame members of the chassis and one of the longitudinal supporting members on which the improved. hoisting mechanism is supported.

Figure 2 is a view in transverse section through the chassis shown in Figure 1 and showing partly in elevation and partly in section the operating mechanism for two lifting screws mounted in accordance with the invention.

Figure 3 is a view similar generally to Figure 2 but showing some modified details. As the description proceeds it will be cvi'-' dent that the invention isnot to be limited to the particular location in which it is used. nor to the particular circumstances under which it may be useful although for the purposes of this application the mechanism is shown and will be described with reference to its mounting on the chassis of a motor vehicle propelled in a conventional manner through a longitudinally extending propeller shaft disposed under the chassis and between the side frame members thereof. Referring to Figure 1 such a propeller shaft is indicated at a. and the housing for the differential at the final drive by the reference character 7) and these parts are disposed between two side frame members of the chassis indicated in Figure 2 at 0, (Z. The physical objections to mounting a single cradle between the side frame members 0, (Z, as proposed in the said co-pending applicapresent invention has to do with the mounting of the screw jacks e, f, in casings e, f,

which are supported independently and are so spaced as to afford ample room therehetween for necessary parts of the vehicle such as the propeller shaft a. Other possible advantages from the improvements under some conditions of use will he pointed out more particularly hereinafter. Between the side frame members 0 and (Z are supported parallel beams g, 71, which extend longitudinally for a sufficient distance to afford ample support for the respective housings e, 7', respectively. These beams may be carried on cross-channels g, 5 extending between the side frame members of the chassis, as will be evident. Formed with or secured to the opposite side walls of the casing f, for instance, are trunnions f 7', one of which f is journaled in a bracket d secured to the side frame member (Z and the other of which is journaled in the longitudinal support it. vVi-t-hi-n the housing 7" is mounted a revoln-ble nut 2' through which extends the screw jack f and with which is engaged a drive pinion 7c keyed to the jack shaft in all in the same general manner described in said co-pendinjg application. The other housing '6 is similarly mounted between the bracket 0 on the other side frame member 0 and the other longitudinal support a. The jack shaft 70' is rotated in one direction or another for raising or lifting the screw jacks by the clutch gear Z which is splined thereon and en gageab'le with one or the other of the gearsm or m which, themselves, are rotatable idly from any available source of power. All of the gears referred to may be mounted Within a casing n which has formed the-rein or car- -ries at opposite sides thereof trunnio'ns a, n jo-urnaled, respectively, in the longitudinal members h, g.

The extended Wells 7, e formed at the bottoms of the respective casings 7, e to receive the screw rods 7, 6, respectively, as seen in Figure '2, are spaced apart and at opposite sides of the differential housing '6 and propeller shaft a.

The construction described not only embodies all of the advantages of the principle pointed out in said co-pending case and the fi'irt'l'i'cr advantage of providing clearance for the propeller shaft but, in addition, offers the further possible advantagefthat the {two screw .jaCliS are movable angularly with respect to one another so as to be relieved from stresses which might otherwise he imposed thereon as through weaving of the chassis frame or of the truck body.

lVherea-s in the embodiment shown in said co-pend-inrg case the screw rods are positively held in fixed relation to one another since they "are mounted in a single cradle, in the present embodiment, they are not th-us constrained and the angular position of one is wholly independent of the angular position of the other since the housings in which they are sap ported, respectively, move pivotally on their own trunnions.

Tlreconstruct'ion shewn in Fig-tire 3 does not di-li'er essentially from that shown in Figure 2 except 'tl t it indicates permissible yariatioire in do n which will occur to those skilled in *the art. Prohably the most noticeable difierence' resides in the provision of hemispherical bear rg surfaces F F N, NF, on the several '-t ions by means of which some degree of sele ai ignment is as su-red when the parts are assemhled and, during use.

Other changes of design will occur to one skilled in the art "but departures falling within the skill of a mechanic are not to b regarded as avoidance "of the-scope or spn' it of the present invention as defined in the pended claims.

lVhat we claim is: V

1. In a motor vehicle, in combination with the chassis and propeller-shaft ex-tending longitudinally thereof, hoisting mechanism for a dump hotly fflrduntd 0n the chassis comprising independent "screw iacks daisp'osed at opposite sides of the propeller shaft, revoluble n-ut's by which the ia'clts are raised and lowered,- riieans te support the nuts on the frame with/capacity for zmgu-larmovement of each, inde endent of the other, to conform to the angulari ty =oif the respective screws, and means inoi inted over the propeller shaft and "carried by between the h n-t supporting means for applying power to the-nuts.

2. Hoisting mechanism roar dump bodies including screw j achs'flisposed at oppo'saite side's o'ftl-i'e een-tel line of the body, revoilvmate to actuate sa id jac ks, respectively, supports extending in pai-aiiehsm longitudinally of the chassis atoppesite sides of the center line, "casings which said nets are su ported, means to mount-the separate casings between the chassis frame members and said space-d supperts, respectii'rely,'cornprisin g tru imions mounted I with capacity for independent movement and means carried by the supports and between the casings for applying power to the 1311 68. 7

This specification eignedthis 10th Sept, A. D. 1 923.

J QSIAH REID. GHARLES L. NEl-N.

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